Rotary locking bolt

ABSTRACT

A slide type bolt actuated by rotating a knob for normal opening and closing, and incorporating a rotary action of the bolt at the limit of sliding motion to the closed position. The bolt has notched lugs which lock on to a pin in the bolt receiving socket and prevent sliding withdrawal of the bolt. The locking action makes the bolt adaptable to sliding and double doors, as well as conventional single hinged doors.

United States Patent [191 Carey Apr. 16, 1974 I ROTARY LOCKING BOLT [76]Inventor: John R. Carey, 1996 Milford Pl., El Cajon, Calif. 92020 [22]Filed: Oct. 17-, 1972 211 App]. No.: 298,285

[52] US. Cl. 292/58, 292/59 [51] Int. Cl. E05c 5/04 [58] Field of SearchI. 292/57, 58, 59, 60, 61,

[56] References Cited UNITED STATES PATENTS 2,086,982 7/l937 McCarter70/146 FOREIGN PATENTS OR APPLICATIONS lS0,047 5/1955 Sweden 292/58Primary Examiner-Robert L. Wolfe Attorney, Agent, or Firm-Brown andMartin [57] ABSTRACT A slide type bolt actuated by rotating a knob fornormal opening and closing, and incorporating a rotary action of thebolt at the limit of sliding motion to the closed position. The bolt hasnotched lugs which lock on to a pin in the bolt receiving socket andprevent sliding withdrawal of the bolt. The locking action makes thebolt adaptable to sliding and double doors, as well as conventionalsingle hinged doors.

3 Claims, 10 Drawing Figures ROTARY LOCKING BOLT BACKGROUND OF THEINVENTION One common type of security bolt used on kitchen doors and thelike has a sliding bolt operated by rotating a knob to actuate a rackand pinion type mechanism. The bolt is usually fitted into the door andthe end of the bolt seats in a socket or striker plate in the door jamb.The use is limited to single hinged doors and, unless the clearancebetween door and jamb is very close, it is possible to force the boltback. Since this type of bolt is simple to install and operate, it wouldbe advantageous to have a positive locking means and extend theusefulness of the bolt to other types of doors.

SUMMARY OF THE INVENTION The bolt mechanism described herein utilizes arotary knob actuated slide bolt and incorporates rotation of the bolt,also actuated by the knob, for positive looking action. The socket inwhich the end of the bolt seats contains a fixed retaining pin, the boltend being slotted to clear the pin in normal sliding action. At oppositesides of the clearance slot are notched lugs which lock on the retainingpin when the bolt is rotated.

In one form the knob is connected to the bolt by a crank arm and link,the rotation being accomplished by a cam during the final sliding motionof the bolt. The linkage travels over center at the fully lockedposition for added security. In another form the conventional rack andpinion type mechanism is modified to incorporate rotation by sliding theknob along a slot. The positive locking of the mechanism makes the boltadaptable to double doors, sliding doors, windows and the like. v

The primary object of this invention, therefore, is to provide a new andimproved rotary locking bolt.

Another object of this invention is to provide a new and improved slidebolt actuated by rotating a knob and having a rotary action in theclosed position to lock on a retainer.

A further object of this invention is to provide a new and improvedslide bolt in which the complete bolting and locking action iscontrolled by the single knob.

Other objects and many advantages of this invention will become moreapparent upon a reading of the following detailed description and anexamination of the drawings, wherein like reference numerals designatelike parts throughout and in which BRIEF DESCRIPTION OF THE DRAWING FIG.1 is a top plan view of one form of the bolt assembly, portions of adoor structure being indicated in broken line.

FIG. 2 is a sectional view taken on line2-2 of FIG. I, the bolt beingopen.

FIG. 3 is a view similar to FIG. 2, but with the bolt closed and locked.

FIG. 4 is a sectional view taken on line 4--4 of FIG. 2.

FIG. 5 is a sectional view taken on line 5-5 of FIG. 2.

FIG. 6 is a view from the left hand end of FIG. 2. FIG. 7 is a view fromthe left hand end of FIG. 3. FIG. 8 is a top plan view of an alternativeform of the bolt assembly.

FIG. 9 is a sectional view taken on line 9-9 of FIG. 8.

FIG. 10 is a view from the left hand end of FIG. 9.

DESCRIPTION OF THE PREFERRED EMBODIMENT In the form illustrated in FIGS.1-7, the bolt assembly comprises a bolt unit 10 recessed in a door 12and a socket unit 14 in the door jamb 16. It should be under stood thatthe door jamb is used for purposes of description only, since the socketunit could be in another door, either sliding or hinged.

Bolt unit 10 comprises a cylindrical barrel l8 fixed to an end plate 20which seats in the edge portion of the door, the barrel being containedin a suitable bore made in the door. Slidably mounted in barrel 18 is abolt 22, one end of which has a diametrical slot 24, the slot extendinglongitudinally into a pair of rotatably offset notches 26 which leaveend portions of the bolt forming opposed lugs 28. At the other end ofbolt 22 is an axially extending, reduced diameter stud 30, on which ismounted a cap 32. The cap is free to rotate but is held against axialmovement by a snap retainer 34 re cessed into a circumferential groove35 in stud 30.

Diametrically mounted in barrel 18 is a sleeve 36 having a square orotherwise non'circular bore 38. The actuating knob 40 is secured on ashaft 42 which matches the cross section of and is slidable through bore38, to facilitate installation and removal of the bolt. In FIG. 1, theshaft is shown extending through the door and could be fitted with anexternal knob, not

shown, of the locking type. For internal operation only the shaft wouldterminate in the barrel 18. Fixed to sleeve 36 are radially extendingarms 44 and pivotally attached to the arms is a link 46, held betweenthe arms by a hinge pin 48. The other end of link 46 is pivotallyconnected to cap 32 by a hinge pin 50. Barrel 18 has an elongatedopening 52 to provide clearance for the arm and link motion.

Fixed through bolt 22 is a cam follower pin 54, the ends of which ridein opposed cam slots 56 in barrel 18. The major portions of the camslots are longitudinally straight, to guide the bolt axially with theend slot 24 held in alignment. Adjacent the end plate 20 the cam slots56 have helical portions 58, which cause the bolt to be rotated as itmoves axially, the rotation indicated being about 60 as an example.

Socket unit 14 comprises a cylindrical socket element 60 to receive thebolt 22, the socket element being fixed to an end plate 62 which isseated in jamb 16. Fixed diametrically across the socket element is aretainer pin 64, over which the end slot 24 of the bolt will passfreely.

In the retracted position of the bolt, as in FIGS. 1 and 2, the arms 44are pulled back so that link 46 rests on sleeve 36 and acts as a stop.When knob 40 is rotated counterclockwise, link 46 pushes. the bolt 22axially until the end enters socket element 60. If the rotation of theknob is stopped when a slight resistance is felt, the bolt will merelyhold the door in the manner of a conventional slide bolt. Continuedrotation of the knob, however, will cause follower pin 54 to ride in thehelical portions 58 of the cam slots and rotate the bolt. Retainer pin64 will thus be engaged in notches 26 and lugs 28 will lock the boltagainst axial displacement. In the locked position the arm and linkconnection will swing over center beyond a line joining the centers ofhinge pin 50 and shaft 42, until arms 44 rest on the bottom of barrel 18as in FIG. 3, providing a secure locking action against forced movementof the bolt. It is this positive locking which makes the bolt assemblysuitable for sliding or double folding doors.

The alternative form of the bolt assembly illustrated in FIGS. 8-10comprises a bolt unit 70 mounted in door 72 and a socket unit 74 in jamb76. The bolt unit has a cylindrical barrel 78 mounted on an end plate80, which is seated in the edge of the door. Bolt 82, slidably mountedin barrel 78, has a diametrical slot 84 in one end, the slot extendinginto rotatably offset notches 86 leaving opposed lugs 88 at the ends ofthe slot. The other end of bolt 82 has an integral, longitudinallyextending toothed rack 90, which is engaged by a pinion toothed shaft 92extending substantially diametrically through barrel 78. Rotation of aknob 94 fixed on extended shaft 92 moves the bolt axially.

Barrel 78 is rotatably held in end plate 80, such as by the flanged end96 of the barrel outside the end plate and a retaining collar 98 on theother side. Shaft 92 extends through a vertical guide slot 100 in anescutcheon plate 102, which is secured on the inside face of door 72,the guide slot providing controlled vertical motion of the knob 94 andcorresponding rotary motion of barrel 78 and bolt 82.

Socket unit 74 comprises a cylindrical socket element 104 fixed to anend plate 106 and having a retaining pin 108 fixed diametrically acrossthe socket element. In normal slide action of the bolt, slot 84 willclear the retaining pin, the bolt being operated with the knob 94 at theupper end of guide slot 100, as in FIG. 8 and in the broken lineposition in FIG. 9. To lock the bolt the knob 94 is depressed to thebottom of guide slot 100, causing bolt 82 to be rotated and lugs 88 tolatch over the retaining pin 108, as in the full line position in FIG.10. The bolt is thus operable as a normal slide bolt, or with the addedrotating and locking action, making it also suitable for sliding ordouble doors.

Having described my invention, I now claim: l. A rotary locking bolt,comprising:

a bolt unit having means for mounting in a movable door; a socket unithaving means for mounting in a door structure against which the movabledoor closes; said bolt unit having a cylindrical barrel with a boltslidably retained therein;

one end of said bolt having a slot with rotatably offset notched lugs;

said socket unit having a socket element with a retaining pin fixedtherein to receive the slotted end of the bolt;

a knob having a shaft passing through said barrel;

actuating means including an arm extending from said shaft, and a linkpivotally interconnecting said arm and said bolt for sliding operationof the bolt;

and said actuating means further including rotating means for rotatingthe bolt to lock said lugs over said retaining pin.

2. A rotary locking bolt according to claim 1, wherein said barrel hasclearance for the pivotal connection of said arm and link to pass overcenter and lock beyond a line between the center of said shaft and thepivotal connection of the link to the bolt.

3. A rotary locking bolt according to claim 2, and including a caprotatably retained on the other end of said bolt, said link beingattached to the cap.

1. A rotary locking bolt, comprising: a bolt unit having means formounting in a movable door; a socket unit having means for mounting in adoor structure against which the movable door closes; said bolt unithaving a cylindrical barrel with a bolt slidably retained therein; oneend of said bolt having a slot with rotatably offset notched lugs; saidsocket unit having a socket element with a retaining pin fixed thereinto receive the slotted end of the bolt; a knob having a shaft passingthrough said barrel; actuating means including an arm extending fromsaid shaft, and a link pivotally interconnecting said arm and said boltfor sliding operation of the bolt; and said actuating means furtherincluding rotating means for rotating the bolt to lock said lugs oversaid retaining pin.
 2. A rotary locking bolt according to claim 1,wherein said barrel has clearance for the pivotal connection of said armand link to pass over center and lock beyond a line between the centerof said shaft and the pivotal connection of the link to the bolt.
 3. Arotary locking bolt according to claim 2, and including a cap rotatablyretained on the other end of said bolt, said link being attached to thecap.